Z-machine versions

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There are at least 10 different versions of the Z machine out there:

XOR support

v9 and v10 story files give Z-machines XOR support by defining the 2OP instruction 29 (1D in hex) as being BXOR, with works like BOR or BAND, but performs a binary exclusive OR operation. Note that Glulx has always had XOR support (via the "bitxor" operation).